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Abstract

The device detects short circuits in switching networks having semiconductor controlled rectifiers as crosspoint switches.

Country

United States

Language

English (United States)

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Short Circuit Test Device

The device detects short circuits in switching networks having semiconductor
controlled rectifiers as crosspoint switches.

The DC path in a telephone switching network extends between subscriber
transformer ST and terminal junctor TJ5. This DC path comprises controlled
rectifier gates CA...CF for matrix levels A...F and feeders FC and FF. This path
is established in two steps. In the first, FC is switched on and CA, CB, and CC
are fed with a control pulse. DC current flows now from the 24V source to
ground through CA, CB, CC, and FC. In the step, FF is switched on and CD, CE,
and CF are fed with a control pulse. DC current flows also through CD, CE, CF,
feeder FF and ground. If subscriber S is only to be connected to median junctor
M5, only the first step is used.

This device detects short circuits occurring between the C level matrix
outputs and ground GC and between the F level matrix outputs and ground GF.
It also detects if a feeder is erroneously on or short circuited. The test device is
composed of a test network which is a three-input switching matrix TN having
controlled rectifiers as crosspoint switches, three limit-detectors LD1, LD2, LD3
through which the three test network input lines are connected to a +24 V source,
and majority circuit MC which controls an alarm device AL in case two or three
detectors detect a current.

Each output line of TN is connectable through controlled rectifiers to several
output lines from the C level matrix. For example, output line LT1 is connectable
respectively to lines LCA, LCB, and LCC through rectifiers CRA, CRB, and CRC.
Output line LT2 is connectable to three other lines from C level matrices through
three other controlled rectifiers, etc. In addition, the gates of al...